Hello Doctor.. ! I Am 27 Year Women And From

Hello doctor.. ! i am 27 year women and from last seasonally i suffer from phlegm formation without suffering from any other sickness. i m quite healthy person and have healthy diet and life style... every day in the morning feel the blockage in throat because of phlegm and after morning brush and cleaning ... it again start forming... ! i do not know what is causing it ! i want a remedy for it . kindly help